/*
* Now let's run another query to change the model name of the
* product with id = 1.
*
* All non select queries need to be run using the
* KKBasePeer.executeStatement command
*/
KKBasePeer.executeStatement(
"update products set products_model='Super Turbo' where products_id=1");

The
/java_api_examples/src/com/konakart/apiexamples/RunCustomQuery.java
example, provided in the download kit, illustrates this technique.